Improvement in rock-drills



J, M. RAYMOND. Improvement in'Rock-Drills.

Patented Sep.10,1872.

lnvkantor.

Witnesses.

AM PHDTfl-LITHUGIMFIIIC C0. M Z OSBURNKS P1206553) JAMES M. RAYMOND,

PATENT Orrrcn.

or new YORK, N. Y.

IMPROVEMENT IN ROCK-DRILLS.

Specification forming part of Letters Patent N0. 131,301, dated September 10, 1872.

Specification of certain Improvements in Rock-Drills, invented by JAMES M. RAYMOND, of the city, county, and State of New York.

Nature and Objects of the Invention.

My invention consists, first, in the employment of a sliding frame to adjust the drill vertically up and down when said sliding frame carries a rock-shaft which operates the drillhammer, a bent arm to raise and turn the drill, and a rest which serves as a support for a guide and gage for the liftin g-and-turnin g arm, and has also a perforation at one extremity to guide the drill. My invention further consists in the peculiar construction of the guide and gage for the lifting and turning of the drill by the adjustment of which the drill may be rotated to a greater or less degree, depending on the hardness of the rock. My invention also consists in the employment of a guide for the drill, near its lower end, which is attached to the base by a thumb-screw or other equivalent device, has a perforation to receive the drill, and is capable of being turned out of the way in cleaning out the hole made by the drill.

In the accompanying drawing, Figure 1 is a perspective view of a machine embodying my invention. Fig. 2 is a vertical longitudinal section of the front part of the same. Fig. 3 is a horizontal section of the front part of the machine. Fig. 4 is an under-side view of a wheel on the upper end of the drill.

General Description. A is the bed or base of the. machine, triangular in form, and having a projecting piece,

B, at its apex. G O G are inclined perforations or holes made in the legs of the triangutriangular bed. In the opening, at the vertex of the triangle, is pivoted the treadle F, which is connected at its opposite extremity with a rock-shaft, H, by means of a chain, G, which may be adjusted with regard to its length. The rock-shaft H turns in a sliding frame, I, which is capable of a vertical adjustment up attached to the back face of the sliding frame I, which gear with the pinions N N on the horizontal shaft 0, which has its bearings in the journal boxes P P attached to the uprights L L. Q, is a roughened wheel on one extremity of the shaft 0, by the rotation of which the sliding frame may be raised or lowered as the drill descends into the rock; and R is a pinion, and S a pawl, engaging with the former to prevent the rotation of the shaft in a contrary direction. T is the hammer-shaft, firmly secured to the rock-shaft H, and provided at its upper extremity with the hammer. V is a projection secured to the rock-shaft, and connected with the spring W attached to the bed by means of the adjustable chain X, which raises the hammer when the power has been withdrawn from the treadle. It is obvious that a vertical shaft attached to one of the uprights, and provided with a worm which engages with a worm-wheel on the end of the horizontal shaft 0, said vertical shaft being operated by a hand-wheel, may be employed to adjust the sliding frame. Y is a rest or support attached to the cross-bar Z of the sliding frame I, and provided at its outer end with a guide-hole, a, through which the drill 1) passes. The rest Y serves also to support the guide and gage c, hereinafter more fully described. d is a bent arm, pivoted to the rock-shaft at its inner end, and guided in its reciprocating nrovement by the slot 0 in the guide and gage c. The outer end of the bent arm 01 engages with the wheel f, provided with ratchet-teeth on its upper and lower faces, through the center of which the drill passes. In the recipro eating movement given the bent arm 61 by the oscillations of the rock-shaft, the former will both lift and turn'the drill by reason of its end engaging with the ratchet-teeth on the lower face of the wheel f. g is a dog, pivoted to the sliding frame at its inner end, its outer end engaging with the ratchet-teeth on the upper face of the wheel f to prevent back rotary motion of the drill. The wheel f may be constructed of wrought or cast iron, or the interior art may be made of wood surrounded it is attached to the base.

by a band of iron on which the ratchet-teeth are made. This construction gives greater lightness to the parts. 0 is the guide and gage, bent at or near its middle, as shown in the drawing, and attached to the restYby athumbscrew, it, or other equivalent device, by means of which it may be rotated about the screw as a center. The upper bent end of the guide and gage c is slotted at e to receive the bent arm (I, and thus acts as a guide for the arm in engaging with the ratch et-teeth of the wheel By so constructing the guide and gage c' that it may be rotated about the screw it a greater or less rotation of the drill may be obtained; the rotation of the drill being greatest when the end of the bent arm at engages with the ratchet-teeth near the center of the wheel f, and less when it engages with the ratchetteeth on the wheel at the outer extremity of the radius or at the circumference. The part 0 thus acts both as a guide for the lifting-andturning arm d, and also as a gage by means 'of which the rotation of the drill may be accurately adjusted, it being necessary that the drill should rotate slowly in drilling hard rock, and that it should rotate or turn more in softer rock. h is a guide-plate, attached, by a screw, m, or otherwise, to the bed of the machine, which is capable of being circularly turned out of the way on the screw or pin m, by which The outer end of When the hole made by the drill is partially filled with the dust and debris from the action of the machine the drill is removed and the guide-plate It turned out of the way for the purpose of removing the dust from the hole.

Claims.

I claim as new and of my invention- 1. The rock-shaft H, in combination with the sliding frame I, provided with a rest, Y, having a guidehole for the drill, substantially as set forth.

2. The guide and gage 0, slotted at c to receive the bent arm at and capable of being rotated, as and for the purposes set forth.

3. The bent arm 01 and gage c in combination with the wheel f, provided with ratchet-teeth on its upper and lower faces and dog g, substantially as described, and for the purposes set forth.

4. The combination of the sliding frame I,

Witnesses OCTAVIUS KNIGHT, WALTER ALLEN. 

